mineral
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, opaque, red to reddish-brown, with a glassy to waxy luster and no visible cleavage. The smooth oval shape indicates mechanical tumbling and polishing; exact identification is uncertain from an image alone.
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Physical properties
Typically Mohs hardness 6.5–7, opaque, red to reddish-brown, with a glassy to waxy luster and no visible cleavage. The smooth oval shape indicates mechanical tumbling and polishing; exact identification is uncertain from an image alone.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement fine-grained sediment or volcanic material, with iron producing the red color. Deposits occur in many geological ages, commonly in volcanic and sedimentary environments.
Uses & applications
Used for beads, cabochons, carvings, bookends, and decorative objects; it has modest gemstone and lapidary value.
Geological facts
Red jasper is a variety of chalcedony/microcrystalline quartz rather than a single strictly defined mineral species. Red coloration generally reflects hematite or other iron-oxide inclusions.
Field identification & locations
Identify it by its opaque red body color, very fine texture, quartz-like hardness, and inability to scratch with a steel knife; it should scratch ordinary glass. Common sources include India, Brazil, Madagascar, South Africa, and the western United States.
